MIC5232
10mA Ultra-Low Quiescent Current
µCap LDO
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2012 M9999-061812-
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General Description
The MIC5232 is an ultra-low quiescent current, low-
dropout linear regulator that is capable of operating
from a single-cell lithium ion battery. Consuming only
1.8µA of quiescent current while operating, the
MIC5232 is ideal for stand-by applications like
powering real-time clocks or memory in battery
operated electronics.
The MIC5232 is capable of providing 10mA of output
current and has low output noise, providing a small,
efficient solution ideal for any keep-alive application.
This includes reverse current protection, keeping
reverse leakage (VOUT > VIN) down to 20nA.
The MIC5232 is a µCap design, operating with very
small ceramic output capacitors for stability, reduction
of required board space and component cost.
The MIC5232 is available in fixed output voltages in
the miniature 6-pin 2mm x 2mm MLF® package and
thin SOT-23-5 package with an operating junction
temperature range of -40°C to 125°C.
Features
Input voltage range: 2.7V to 7.0V
Ultra-low Iq: Only 1.8µA operating current
Stable with 0.47µF ceramic output capacitor
Low dropout voltage of 100mV @ 10mA
Reverse Battery Protection
High output accuracy:
– +2.0% initial accuracy
– +3.0% over temperature
Logic-Level Enable Input
Miniature 6-pin 2mm x 2mm MLF package
Lead-Free Thin SOT-23-5 Package
Tight Load and Line Regulation
Applications
Real-Time Clock Power Supply
Stand-by Power Supply
SRAM Memory Back-up Supply
Cellular Telephones and Notebook Computers
Typical Application
VIN VOUT
EN
GND
MIC5232-1.2YD5
VOUT
VIN
3.6V 1.2V
0.47µF
ceramic
1µF
1.5 Real-Time Clock Back-up Su pply 0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3.0
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
VOUT = 1.2V
IOUT = 100µA
COUT = 0.47µF
Micrel, Inc. MIC5232
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Ordering Information
Part Number Marking
Code(1) Voltage(2) Junction
Temperature Range Package Lead Finish
MIC5232-1.2YD5 ZA12 1.2V –40°C to +125°C TSOT-23-5 Pb-Free
MIC5232-1.8YD5 ZA18 1.8V –40°C to +125°C TSOT-23-5 Pb-Free
MIC5232-2.5YD5 ZA25 2.5V –40°C to +125°C TSOT-23-5 Pb-Free
MIC5232-2.8YD5 ZA28 2.8V –40°C to +125°C TSOT-23-5 Pb-Free
MIC5232-3.3YD5 ZA33 3.3V –40°C to +125°C TSOT-23-5 Pb-Free
MIC5232-1.2YML 12Z 1.2V –40°C to +125°C 6-Pin 2mm x 2mm MLF(3) Pb-Free
MIC5232-1.8YML 18Z 1.8V –40°C to +125°C 6-Pin 2mm x 2mm MLF(3) Pb-Free
MIC5232-2.5YML 25Z 2.5V –40°C to +125°C 6-Pin 2mm x 2mm MLF(3) Pb-Free
MIC5232-2.8YML 28Z 2.8V –40°C to +125°C 6-Pin 2mm x 2mm MLF(3) Pb-Free
MIC5232-3.3YML 33Z 3.3V –40°C to +125°C 6-Pin 2mm x 2mm MLF(3) Pb-Free
Notes:
1. Overbar/Underbar symbol ( / __ ) may not be to scale.
2. Other voltages available. Contact Micrel Inc. for more details.
3. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
.
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Pin Configur ation
Pin Description
Pin Number
TSOT-23-5 Pin Number
MLF Pin Name Pin Name
1 3 VIN Supply Input.
2 2 GND Ground.
3 1 EN Enable Input. Active High. High = on, Low = off. Do not leave floating.
4 5 NC Not Internally Connected.
5 4 VOUT Output (10mA output current).
- 6 NC Not Internally Connected.
- EP ePad Exposed pad connected-to-ground.
Block Diagram
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Absolute Maximum Ratings(1)
Supply Input Voltage (VIN)................................0V to 8V
Enable Input Voltage (VEN)...............................0V to 8V
Power Dissipation (PD) .................... Internally Limited(3)
Junction Temperature (TJ).................. –40°C to +125°C
Storage Temperature (TS).................. –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ................. 260°C
ESD Rating(4)......................................................... ±2kV
Operating Ratings(2)
Supply voltage (VIN) ...................................... 2.7V to 7V
Enable Input voltage (VEN)...............................0V to VIN
Thermal Resistance
TSOT-23-5 (θJA)......................................... 235°C/W
MLF-6 (θJA) .................................................. 90°C/W
Electrical Characteristics(5)
VIN = VOUT + 1.0V, COUT = 0.47µF, IOUT = 100µA, TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter Conditions Min Typ Max Units
Variation from nominal VOUT -2.0 +2.0 % Output Voltage Accuracy
Variation from nominal VOUT; -40C to +125C -3.0 +3.0 %
Output Voltage Temp. Coefficient 40 ppm/C
Line Regulation VIN = VOUT +1V to7V;
0.02
0.25 %/V
Load Regulation IOUT = 10µA to 10mA 0.2 1.0
1.5 %
%
Dropout Voltage(6) IOUT = 100µA
IOUT = 10mA
60
100
300 mV
mV
Ground Pin Current IOUT = 10µA 1.8 3 µA
Ground Pin Current in Shutdown VEN < 0.18V 0.1 1.5 µA
Current Limit VOUT = 0V 70
120 mA
Reverse Current (VOUT > VIN) VOUT = VIN + 1V 0.02 1 µA
Ripple Rejection f = 10Hz
f = 1kHz
55
35
dB
dB
Output Voltage Noise COUT =0.47µF; 10Hz to 100kHz 400 µVrms
Enable Input
Logic Low (Regulator Shutdown) 0.18 V Enable Input Voltage
Logic High (Regulator Enabled) 1.4 V
VIL < 0.18V (Regulator Shutdown) 1 nA Enable Input Current
VIH > 1.4V (Regulator Enabled) 1 nA
Turn-on Time(7) COUT = 0.47µF 0.75 1.5 ms
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable
power dissipation will result in excessive die temperature.
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below
2.7V, dropout voltage is the input-to-output differential with the minimum input voltage 2.7V.
7. Turn-on time is measured from 10% of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
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Typical Characteristics
Ripple Rejection
0
10
20
30
40
50
60
70
80
0.01 0.1 1 10 100 1000 10000
FREQUENCY ( k Hz)
PSRR ( dB)
V
OUT
=3.3V
V
IN
=V
OUT
+1V
I
OUT
=100µA
C
OUT
=.47µF
Dropout Voltage vs.
Out put Current
0
20
40
60
80
100
120
012345678910
O UT PUT CURR ENT (mA)
DRO P OUT VO L TA GE (mV)
V
OUT
= 3.3V
C
OUT
= 0.47µF
Dropout Voltage
vs. Temperature
0
10
20
30
40
50
60
70
80
90
-40-20 0 2040 6080100120
TEMPERAT URE (°C)
DRO PO UT VOLTAG E (mV)
VOUT=3.3V
IOUT=100µA
COUT =0.47µF
Dropout Vol tage vs.
Temperature
0
20
40
60
80
100
120
140
160
-40-20 0 20406080100120
TEMPERATURE (°C)
DRO PO UT VOLTAG E ( m V )
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
= 0.47µF
Output Voltage
vs. Input Voltage
0
0.2
0.4
0.6
0.8
1
1.2
1.4
01234567
INPUT VOLTA G E ( V)
OUTPUT VOLTAGE (V)
V
OUT
=1.2V
V
IN
=V
OUT
+1V
C
OUT
=0.47µF
10mA
100µA
Output Voltage
vs. Temperat ure
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
-40-20 0 2040 6080100120
TEM PERATURE (° C)
O UTPUT VOLTAGE ( V)
V
OUT
= 3.3V
V
IN
= V
OUT
+1V
C
OUT
= 0.47µF
Ground Pin Current
vs. Output Current
0
2
4
6
8
10
12
14
012345678910
O UTPUT CURRENT ( m A)
G RO UND CURRENT ( µ A)
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
= 0.47µF
Ground Pin Current
vs. Input Voltage
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3
2.5 3.5 4.5 5.5 6.5
I NPUT VOLTAGE ( V)
G RO UND CURRENT ( µ A)
V
OUT
= 1.2V
I
OUT
= 100µA
C
OUT
= 0.47µF
Ground Pin Current
vs. Input Voltage
0
2
4
6
8
10
12
14
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
I NPUT VOL TA GE (V)
G RO UND CURRENT ( µ A)
V
OUT
= 1.2V
I
OUT
= 100uA
C
OUT
= 0.47µF
Ground Pin Current vs.
Temperature
0
2
4
6
8
10
12
14
16
18
20
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (° C)
G ROUND CURRENT (µ A)
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
=0.47µF
I
OUT
=10mA
Current Limit
0
10
20
30
40
50
60
70
80
90
100
2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
I NPUT VOLTAGE ( V)
CURRENT LI M IT (mA)
V
OUT
= 3.3
C
OUT
= 0.47µF
Enable-On Threshold vs.
Temperature
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
ENABLE THRESHOLD (V)
V
OUT
= 3.3V
V
IN
= V
OUT
+ 1V
C
OUT
= 0.47µF
Micrel, Inc. MIC5232
June 2012 6 M9999-061812-
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Typical Characteristics (continued)
Turn-On Tim e
0
200
400
600
800
1000
1200
1400
-40 -20 0 20 40 60 80 100 120
Temperature ( ° C)
Tim e (µs)
V
OUT
= 1.2V
V
IN
= 2.7V
C
OUT
= 1uF
I
OUT
= 100uA
Short Circuit Current vs.
Temperature
0
10
20
30
40
50
60
70
80
90
-40 10 60 110
TEM PERAT URE (° C)
S HO RT CIRCUIT CUR RENT (mA)
V
OUT
= 0V
V
IN
= 4.3V
C
OUT
= 0.47µF
Rev erse Leakage Current
(V
OUT
> V
IN
)
0
10
20
30
40
50
60
70
80
90
100
2.5 3.0 3.5 4.0 4.5 5.0 5.5
OUTPUT VO LTAGE (V)
REVERSE CURRENT (nA)
(V
OUT
CURRENT)
V
IN
=2.7V
C
OUT
=0.47µF
1E-02
1E-01
1E-00
1E+01
1E+02
Output Noise
Spectral Density
0.1 100
FREQUENCY (kHz)
VOUT = 1.2V
VIN = 4.3V
ROUT
COUT = 0.47µF
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Functional Characteristics
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Application Information
Input Capacitor
If there is more than 20cm of wire between IN and the
ac filter capacitor or if supplied from a battery, a 1µF
(or larger) capacitor should be placed from the IN
(supply input) to GND (ground).
Output Capacitors
The MIC5232 requires an output capacitor for stability.
A 0.47µF, or larger capacitor, is recommended
between VOUT (output) and GND to improve the
regulator’s transient response. A 0.47µF capacitor can
be used to reduce overshoot recovery time at the
expense of overshoot amplitude. The ESR (effective
series resistance) of this capacitor has no effect on
regulator stability, but low-ESR capacitors improve the
high frequency transient response. The value of this
capacitor may be increased without limit, but values
larger than 10µF tend to increase the settling time
after a step change in input voltage or output current.
Minimum Load Current
The MIC5232 does not require a minimum load for
proper operation. This allows the device to operate in
applications where very light output currents are
required for keep-alive purposes. This is important for
powering SRAM or Flash memory in low-power
modes for handheld devices.
Safe Operating Conditions
The MIC5232 incorporates current limit in the design.
There is also reverse circuit protection circuitry built
into the device. The maximum junction temperature
for the device is +125C, and it is important that this is
not exceeded for any length of time.
Thermal Considerations
The MIC5232 is designed to provide 10mA of
continuous current in a very small package. Maximum
ambient operating temperature can be calculated
based on the output current and the voltage drop
across the part. Given that the input voltage is 4.3V,
the output voltage is 3.3V and the output current =
10mA.
The actual power dissipation of the regulator circuit
can be determined using the equation:
PD = (VIN – VOUT) IOUT + VIN IGND
Because this device is CMOS and the ground current
is typically <15μA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
P
D = (4.3V – 3.3V) • 10mA
P
D = 0.01W
To determine the maximum ambient operating
temperature of the package, use the junction-to-
ambient thermal resistance of the device and the
following basic equation:
JA
AJ
DTT
P
(max)
(max)
TJ(max) = 125C, the max. junction temperature of the
die, θJA thermal resistance = 90C/W for the 2mm x
2mm MLF® package.
Substituting PD for PD(max), and solving for the
ambient operating temperature, will give the maximum
operating conditions for the regulator circuit. The
junction-to-ambient thermal resistance for the
minimum footprint is 90C/W. The maximum power
dissipation must not be exceeded for proper
operation.
For example, when operating the MIC5232-3.3BML at
an input voltage of 4.3V and 10mA load with a
minimum footprint layout, the maximum ambient
operating temperature TA can be determined as
follows:
WC TC
WA
/90
125
01.0
T
A = 124°C
Therefore, a 3.3V application at 10mA of output
current can accept an ambient operating temperature
of 124°C in a 2mm x 2mm MLF®-6 package. For a full
discussion of heat sinking and thermal effects on
voltage regulators, refer to the “Regulator Thermals”
section of Micrel’s “Designing with Low-Dropout
Voltage Regulators” handbook. This information can
be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
Micrel, Inc. MIC5232
June 2012 9 M9999-061812-
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Package Information
5-Pin TSOT-23 (D5)
6-Pin 2mm x 2mm MLF® (ML)
Micrel, Inc. MIC5232
June 2012 10 M9999-061812-
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MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for
its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a
product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for
surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant
injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk
and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Inc.
Mouser Electronics
Authorized Distributor
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MIC5232-1.2YD5 TR MIC5232-2.8YD5 TR MIC5232-2.5YML TR MIC5232-3.3YD5 TR MIC5232-3.3YML TR
MIC5232-1.8YML TR MIC5232-2.8YML TR MIC5232-1.8YD5 TR MIC5232-1.2YML TR MIC5232-2.5YD5 TR
MIC5232-1.2YML-TR MIC5232-1.2YD5-TR MIC5232-2.5YD5-TR MIC5232-1.8YD5-TR MIC5232-3.3YD5-TR
MIC5232-2.8YML-TR MIC5232-1.8YML-TR MIC5232-2.5YML-TR MIC5232-3.3YML-TR MIC5232-2.8YD5-TR
